For the first time, a cascaded diamond Raman vortex laser directly emitting within the cavity has been reported. Employing a two-mirror structured diamond Raman oscillator pumped by a 1064 nm Gaussian laser, first- and second-order Raman transitions yielded outputs at 1240 and 1485 nm, respectively. By incorporating the off-axis rotation of cavity mirrors, both wavelength bands produced spatially symmetrical distributions of Hermite–Gaussian (HG) and Laguerre–Gaussian (LG) vortex beams. The achieved maximum output powers for the first and second Stokes vortex lasers were 42 and 22 W, respectively, corresponding to conversion efficiencies of 15.3% and 5.8%. Benefiting from diamond’s exceptional thermal properties, no saturation or decline in the Raman vortex output power was observed within the experimental pump power range. The straightforward off-axis adjustment methodology introduced into a diamond Raman cavity with superior optical and thermal characteristics enables direct dual-wavelength vortex emission, validating diamond Raman oscillators as an effective means of expanding the wavelength of the vortex laser. This breakthrough holds significant implications for expanding the working wavelengths and output powers of vortex beams.

中文翻译：

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金刚石拉曼涡旋激光器


首次报道了直接在腔内发射的级联金刚石拉曼涡旋激光器。采用由 1064 nm 高斯激光器泵浦的双镜结构金刚石拉曼振荡器，一阶和二阶拉曼跃迁分别在 1240 nm 和 1485 nm 处产生输出。通过结合腔镜的离轴旋转，两个波段都产生了空间对称的埃尔米特-高斯 （HG） 和拉盖尔-高斯 （LG） 涡旋光束分布。第一和第二斯托克斯涡旋激光器实现的最大输出功率分别为 42 W 和 22 W，对应的转换效率分别为 15.3% 和 5.8%。得益于金刚石卓越的热性能，在实验泵浦功率范围内未观察到拉曼涡旋输出功率的饱和或下降。金刚石拉曼腔中引入的简单离轴调整方法具有卓越的光学和热特性，可实现直接双波长涡旋发射，验证了金刚石拉曼振荡器是扩大涡旋激光器波长的有效手段。这一突破对于扩展涡旋光束的工作波长和输出功率具有重要意义。